swing - How to create a missing java class? -

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i have application 3 classes (mainclass, classa , classb). mainclass runs no problem, when try run classa or classb, following stacktrace message:

error: not find or load main class mypackage.classa or error: not find or load main class mypackage.classb

when looked in build folder, mainclass.class file there, there no classa.class or classb.class files, sure causing problem.

i tried creating classes scratch didn't fix problem, , tried performing clean , build keeps on failing hasn't helped either.

how can create missing class files correct problem?

the files in build folder are:

in build folder there's mainclass$1 - 10.class, mainclass.form, mainclass.class, classa$1 - 10.class, classa.form, classb$1 - 10.class , classb.form


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